mineral

Pyrite (“fool’s gold”), likely in a quartz-rich matrix

Pyrite, FeS₂

AI-generated identification · may be incorrect

Brassy yellow, metallic luster, granular to crystalline texture; Mohs hardness 6–6.5, cubic crystal system, no prominent cleavage, specific gravity about 5.0. The photo’s small specimen is not sufficient to confirm the identification.

Identified September 26, 2026More mineral →

Explore Pyrite (“fool’s gold”), likely in a quartz-rich matrix in the encyclopedia →

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Physical properties

Formation & geological history

Pyrite forms in many settings, including hydrothermal veins and sedimentary rocks, when iron and sulfur combine under low-oxygen conditions. It occurs from ancient Precambrian deposits to geologically recent formations.

Uses & applications

Collected as a mineral specimen and used in limited sulfur and sulfuric-acid production; it is generally not used as gold ore or jewelry due to brittleness and tarnishing.

Geological facts

Its brassy color and metallic shine earned it the nickname “fool’s gold,” but pyrite is harder and more brittle than gold.

Field identification & locations

Look for a brass-yellow color, brittle fracture, and dark streak; gold is softer and leaves a yellow streak. Pyrite is widespread worldwide, commonly found in veins, coal beds, and sedimentary rocks.